Multiple choice

The clinal model of human variation signifies the fact that

  1. genetically inherited characters will slowly change in frequency among the people you encounter as you travel from one geographic area to another

  2. genetically inherited characters will abruptly change in frequency as you go from one population to another

  3. there lies no significant difference in the frequency of genetically inherited characters among the population of the world

  4. genetically inherited characters will drastically change in frequency among the people you encounter as you travel from one geographic area to another
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A Correct answer
Explanation

Advocates of this model construct clinal maps to visualize the gradual changes. An example is the clinal distribution of the B blood type allele in Europe.

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